/* globals _GDPR */

var CE_GDPR = {
  optInButtonDisabled: true,
  basePath: "https://app.crazyegg.com",

  issueCallbacks: function() {
    if (typeof(_GDPR) !== 'undefined') {
      _GDPR.forEach(function (element) {
        if (typeof(element) === 'string') {
          CE_GDPR._createScriptTag(element);
        } else if (typeof(element) === 'function') {
          element();
        } else if (typeof(element) === 'object') {
          var script = CE_GDPR._createScriptTag(element.src);

          script.onload = function() {
            element.callback();
          };
        }
      });
    }
  },

  _createScriptTag(src) {
    var sc = document.createElement('script');
    sc.setAttribute('type', 'text/javascript');
    sc.setAttribute('src', src);
    sc.async = true;

    var t = document.getElementsByTagName('script')[0];
    t.parentNode.insertBefore(sc, t);

    return sc;
  },

  showModal: function() {
    /* https://app.shortcut.com/crazyegg/story/24467/gdpr-banner */
    if (window.location.hostname === 'app.crazyegg.com') {
      return;
    }

    var ifrm = document.createElement('iframe');
    var iframeStyle = ifrm.style;
    ifrm.setAttribute('src', `${CE_GDPR.basePath}/gdpr/modal`);
    ifrm.style.width = '100%';
    ifrm.style.height = '100%';
    ifrm.style.position = 'fixed';
    ifrm.style.zIndex = '999999999';
    ifrm.style.top = '0';
    ifrm.style.left = '0';
    ifrm.style.border = 'none';

    // Append iframe containing modal to page
    document.body.appendChild(ifrm);

    this._setReloadPageListener();
  },

  canTrack: function() {
    /* https://app.shortcut.com/crazyegg/story/24467/gdpr-banner */
    if (window.location.hostname === 'app.crazyegg.com') {
      return true;
    }
    return true;
  },

  userPresent: function() {
    return false;
  },

  check: function () {
    if (CE_GDPR.canTrack()) {
      CE_GDPR.issueCallbacks();
    } else {
      CE_GDPR.showModal();
    }
  },

  _setReloadPageListener() {
    // IE + others compatible event handler
    var eventMethod = window.addEventListener ? 'addEventListener' : 'attachEvent';
    var eventer = window[eventMethod];
    var messageEvent = eventMethod == 'attachEvent' ? 'onmessage' : 'message';

    // Listen to reload_page message from child
    eventer(messageEvent, function (e) {
      if (e.data === 'reload_page') {
        if (CE_GDPR.userPresent()) {
          CE_GDPR._updateConsent();
        } else {
          window.location.reload();
        }
      }
    }, false);
  },

  _updateConsent() {
    var url = `${CE_GDPR.basePath}/gdpr/accepted_consent`;
    var xhr = new XMLHttpRequest();

    xhr.open('POST', url);
    xhr.onreadystatechange = function() {
      if (this.readyState == 4) {
        window.location.reload();
      }
    };
    xhr.send();
  }
};

if (window.top !== window) {
  CE_GDPR.issueCallbacks();
} else {
  CE_GDPR.check();
}